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NOTE: The primary political divisions of most states are termed counties. Prior to 1982, Alaskan county equivalents were called districts, divisions, or islands. Since 1982, Alaskan county equivalents were reclassified as boroughs or census areas. Virginia has many county-equivalent cities that are or were independent of any county organization.
During the indicated time period, mortality data gathered from the National Center for Health Statistics (NCHS) multiple cause-of-death data files are assigned to specific counties within a state based on current county name. See U.S. Census Bureau for more information (http://www.census.gov/geo/www/tiger/ctychng.html) about county names and the years the changes were made.

1 Mortality data from the "Aleutians Islands" were coded by NCHS from 1968–1993. We arbitrarily recoded these data to the Aleutians East Borough, primarily for mapping purposes. Starting in 1994, NCHS began coding mortality data for both the Aleutians East Borough and the Aleutians West Census Area.2 Mortality data from the Bristol Bay Borough included mortality data from the Dillingham Census Area and the Lake and Peninsula Borough from 1968–1981.3 Mortality data from the Dillingham Census Area included mortality data from the Lake and Peninsula Borough from 1982–1993.4 Kobuk Census Area included the former Kobuk District and the former Kobuk Borough.5 Mortality data from the Skagway-Hoonah-Angoon Census Area included mortality data from the Yakutat Census Area from 1968–1993.6 Skagway-Yakutat-Angoon Census Area included the former Skagway-Yakutat District.7 Mortality data from the Yukon-Koyukuk Census Area included mortality data from the Denali Borough from 1968–1993.8 Mortality data from Yuma County included mortality data from La Paz County from 1968–1993.9 Mortality data from Adams, Boulder, Jefferson, and Weld Counties included mortality data from Broomfield County from 1968–2002.10 Mortality data from Maui County included mortality data from Kalawao County from 1968–1981.11 Mortality data from Valencia County included mortality data from Cibola County from 1968–1981.12 Mortality data from Alleghany County did not include mortality data from Clifton Forge City from 1968–1999.13 Mortality data from Augusta County included mortality data from Waynesboro City from 1968–1969.14 Mortality data from Chesapeake City included mortality data from Portsmouth City and Virginia Beach City from 1968–1969.15 Mortality data from Frederick County included mortality data from Winchester City from 1968–1969.16 Mortality data from Halifax County did not include mortality data from South Boston City from 1968–1995.17 Mortality data from James City County included mortality data from Williamsburg City from 1968–1969.18 Mortality data from Prince William County included mortality data from Manassas City and Manassas Park City from 1968–1981.19 Mortality data from York County included mortality data from Poquoson City from 1968–1981.